Table 1.
Bivariate analyses comparing grade average in the last trimester for girls only
| Variable | Grades 13 and above (above average grades) n = 568 % (n) or mean (SD) | Grades 12 and below (average and below average grades) n = 541 % (n) or mean (SD) | Statistic | P value |
| Age | 17.0 (1.4) | 17.6 (1.4) | t1107 = -7.71 | 0.0005 |
| Days absent in the last 30 d | ||||
| Not absent | 65.8% (374) | 53.2% (285) | ||
| 1 d | 16.0% (91) | 20.1% (108) | ||
| 2 d | 8.5% (48) | 9.5% (51) | χ52 = 24.24 | 0.0005 |
| 3-4 d | 3.9% (22) | 9.0% (48) | ||
| 5-6 d | 2.6% (15) | 3.2% (17) | ||
| 7 or more days | 3.2% (18) | 5.0% (27) | ||
| n = 536 | ||||
| Father’s education level | ||||
| Not educated | 11.4% (58) | 22.4% (109) | ||
| Elementary school | 19.9% (101) | 23.2% (113) | ||
| Middle school | 10.5% (53) | 14.8% (72) | χ42 = 56.59 | 0.0005 |
| High school | 19.7% (100) | 20.9% (102) | ||
| College and beyond | 38.5% (195) | 18.7% (91) | ||
| n = 507 | n = 487 | |||
| Mother’s education level | ||||
| Not educated | 30.9% (167) | 49.1% (255) | ||
| Elementary school | 15.2% (82) | 18.7% (97) | ||
| Middle school | 9.4% (51) | 9.2% (48) | χ42 = 61.97 | 0.0005 |
| High school | 22.0% (119) | 12.9% (67) | ||
| College and beyond | 22.6% (122) | 10.0% (52) | ||
| n = 541 | n = 519 | |||
| Socioeconomic status compared with other families in country | ||||
| Above other families | 25.7% (146) | 20.1% (108) | ||
| Same as other families | 71.0% (403) | 72.5% (390) | χ22 = 12.57 | 0.002 |
| Below other families | 3.3% (19) | 7.4% (40) | ||
| n = 538 | ||||
| Ever used alcohol, hashish, psychotropic, or other drugs | 13.9 (79) | 18.9 (102) | χ2 = 4.96 | 0.026 |
| Age first used alcohol, hashish, or psychotropic drugs | 14.7 (2.5) | 15.7 (2.6) | t142 = -2.30 | 0.023 |
| n = 65 | n = 79 | |||
| Used alcohol, hashish, or psychotropic drugs in the last 12 mo | 6.0 (34) | 7.9 (43) | χ2 = 1.65 | 0.199 |
| Used alcohol, hashish, or psychotropic drugs in the past 30 d | 3.0 (17) | 5.2 (28) | χ2 = 3.39 | 0.066 |